ML17059B136
| ML17059B136 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/21/1996 |
| From: | Hood D NRC (Affiliation Not Assigned) |
| To: | Sylvia B NIAGARA MOHAWK POWER CORP. |
| References | |
| GL-95-07, GL-95-7, TAC-M93488, TAC-M93489, NUDOCS 9605230221 | |
| Download: ML17059B136 (10) | |
Text
Mrs B. Ralph Sylvia Executive Vice Preside and Chief Nuclear Officer Niagara Mohawk Power Corporation Generation Business Group D-2 300 Eric Boulevard West
- Syracuse, NY 130202 Iiay 21, 1996
SUBJECT:
REVEST FOR ADDITIONAL INFORMATION GENERIC LETTER 95-07, "PRESSURE LOCKING AND THERMAL BINDING OF SAFETY-RELATED POWER-OPERATED GATE VALVES," NINE MILE POINT, UNITS 1
AND 2 (TAC NOS.
H93488 AND H93489)
Dear Hr. Sylvia:
On August 17, 1995, the NRC issued Generic Letter (GL) 95-07, "Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves," to request that licensees take actions to ensure that safety-related power-operated gate valves that are susceptible to pressure locking or thermal binding are capable of performing their safety functions.
The NRC staff is reviewing your responses of October 16,
- 1995, and February 13, 1996.
We find that additional information, identified in the enclosure, is needed to complete our review.
We request that you respond within 30 days of the date of this letter.
Please call me at (301) 415-3049 if you have questions or are unable to meet the requested response date.
Sincerely, Original signed by:
I Darl S.
Hood, Senior Project Manager Project Directorate I-1
.Division of,Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket Nos.
50-220 and 50-410
Enclosure:
Request for Additional Information cc w/encl:
See next page DISTRIBUTION:
Docket File J. Zwolinski PUBLIC D.
Hood PDI-1 R/F S. Little S.
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PDR DOCUMENT NAME:
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~ T. Scarbrough To receive a copy of this document, indicate in the box:
"C" = Copy without attachment encl sure "E" - Co with attachment enclosure "N" = No co OFFICE NAME DATE LA:PDI-SLittl 05/
/96 E
PM:PDI-I DNood/rsl 05/4 /96 D:PDI-I JMitchell 05/
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&4001 Nay 21, 1996 Hr. B. Ralph Sylvia Executive Vice President and Chief Nuclear Officer Niagara Hohawk Power Corporation Generation Business Group D-2 300 Eric Boulevard West
- Syracuse, NY 130202
SUBJECT:
REQUEST FOR ADDITIONAL INFORHATION GENERIC LETTER 95-07, "PRESSURE LOCKING AND THERHAL BINDING OF SAFETY-RELATED POWER-OPERATED GATE VALVES," NINE HILE POINT, UNITS 1
AND 2 (TAC NOS.
H93488 AND H93489)
Dear Hr. Sylvia:
On August 17, 1995, the NRC issued Generic Letter (GL) 95-07, "Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves," to request that licensees take actions to ensure that safety-related power-operated gate valves that are susceptible to pressure locking or thermal binding are capable of performing their safety functions.
The NRC staff is reviewing your responses of October 16,
- 1995, and February 13, 1996.
We find that additional information, identified in the enclosure, is needed to complete our review.
We request that you respond within 30 days of the date of this letter.
Please call me at (301) 415-3049 if you have questions or are unable to<<meet the requested response date.
Sincerely, Docket Nos.
50-220 and 50-410
Enclosure:
Request for Additional Information cc w/encl:
See next page Darl S.
Hood, Senior Project Hanager Project Directorate I-l Division of Reactor Projects I/II Office of Nuclear Reactor Regulation
t 4
B. Ral ph Syl vi a Niagara Hohawk Power Corporation Nine Mile Point Nuclear Station Unit Nos.
1 and 2
CC:
Mr. Richard B
Abbott Vice President and General Hanager-Nuclear Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Hr. Hartin J.
McCormick, Jr.
Vice President Nuclear Safety Assessment and Support Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Hs. Denise J. Wolniak Hanager Licensing Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63'ycoming,NY 13093 Mr. Kim A. Dahlberg General Manager Projects Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Mr. Norman L. Rademacher Plant Manager, Unit 1
Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Mr. John T. Conway Plant Manager, Unit 2 Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Resident Inspector U. S. Nuclear Regulatory Commission P.O.
Box 126
- Lycoming, NY 13093 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Hr. Paul D.
Eddy State of New York Department of Public Service'ower Division, System Operations 3 Empire State Plaza
- Albany, NY 12223 Mr. Richard M. Kessel Chair and Executive Director State Consumer Protection Board 99 Washington Avenue
- Albany, NY 12210 Mark J. Wetterhahn, Esquire Winston 8 Strawn 1400 L Street, NW Washington, DC 20005-3502 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, NY 13202 Hr. F. William Valentino, President New York State
- Energy, Research, and Development Authority 2 Rockefeller Plaza
- Albany, NY 12223-1253 Supervisor Town of Scriba Route 8, Box 382
- Oswego, NY 13126 Hr. Richard Goldsmith Syracuse University College of Law E. I. White Hall Campus
- Syracuse, NY 12223 Mr. John V. Vinquist, HATS Inc.
P.O.
Box 63
- Lycoming, NY 13093
P
G RIC TT R 95-07 "PRESSU E LOCKING A H
RMA OF S
F TY-RE ATED POWER-OPERATED GATE VALVES" MI 0
T UC EAR STATION UNIT NOS.
1 AND Please provide the following additional information regarding your responses of October 16,
- 1995, and February 13, 1996, to NRC Generic Letter (GL) 95-07:
Your February submittal states that valves 2CSH*HOV107, HPCS Pump Injection Isolation, and 2ICS*HOV126, RCIC Injection Isolation, have been evaluated as having adequate actuator capacity to overcome the applicable pressure locking scenarios at the specific point of operation during an accident and following the guidance of GL 95-07.
Please provide these evaluations for our review.
Also, please include any thrust requirement and actuator capability calculations that were performed.
2.
In Attachment 1 to GL 95-07, the NRC staff requested that licensees include consideration of the potential for gate valves to undergo pressure locking or thermal binding during surveillance testing.
During workshops on GL 95-07 in each
- Region, the NRC staff stated that, if closing a safety-related power-operated gate valve for test or surveillance defeats the capability of the safety system or train, the licensee should perform one of the following within the scope of GL 95-07:
1.
Verify that the valve is not susceptible to pressure locking or thermal binding while closed, 2.
Follow plant technical specifications for the train/system while the valve is closed, 3.
Demonstrate that the actuator has sufficient capacity to overcome these phenomena, or 4.
Hake appropriate hardware and/or procedural modifications to prevent pressure locking and thermal binding.
The staff stated that normally-open, safety-related power-operated gate valves. that are closed for test or surveillance but must return to the open position should be evaluated within the scope of GL 95-07.
Please state whether valves that meet this criterion were included in your
- review, and discuss how potential pressure locking or thermal binding concerns were addressed.
3.
From its review of operational experience
- feedback, the NRC staff is aware of instances in which licensees have completed design or procedural modifications to preclude pressure locking or thermal binding Enclosure
(
that may have had an adverse impact upon plant safety due to incomplete or incorrect evaluation of the potential effects of these modifications.
Please describe the evaluations and training of plant personnel that you have conducted or plan for each design or procedural modification completed to address potential pressure locking or thermal binding concerns.
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